Abstract
Surface modification of zinc oxide on the [Ni4Al(OH)10]OH has been performed by a chemical surface precipitation method. Inductively coupled plasma measurements show that the amount of ZnO of prepared samples increases with the increase of initial concentration of Zn2+ in the mother solution. Powder X-ray diffraction measurements and scanning electron microscope images show that the modification of ZnO has little effects on the lattice parameters and the particle sizes of the [Ni4Al(OH)10]OH, but does change the morphology. The charge–discharge cycles results show that the deterioration rate of discharge capacity for the electrode with ZnO is only 4.0 % after 255 cycles, which is lower than that of electrode without ZnO (8.5 %); meanwhile, the maximal numbers of exchanged electrons per nickel atom for the electrodes with ZnO are basically over 1.83, which are higher than that of the electrode without ZnO (1.73), indicating that the modification of ZnO can improve the utilization of active material. In addition, the cyclic voltammogram tests results show that the modification of ZnO not only improves electrochemical cyclic reversibility but also elevates the oxygen evolution potential. Electrochemical impedance spectroscopy measurements show that the modification of ZnO can lower the double layer capacitance and the charge transfer resistance.
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Acknowledgments
We would like to thank the National Science Foundation of China (no. 51202054, 21206026, and 81271665), Natural Science Foundation of Hebei Province (no. B2012402006 and B2012402011), and Handan City Science and Technology Research and Development Project of China (no. 1221120095-4) for financial supports.
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Gao, X., Lei, L., Chen, L. et al. Effect of surface modification of zinc oxide on the electrochemical performances of [Ni4Al(OH)10]OH electrode. J Solid State Electrochem 18, 29–38 (2014). https://doi.org/10.1007/s10008-013-2226-9
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DOI: https://doi.org/10.1007/s10008-013-2226-9